Nozzle for ladles



March 13, 1928. 1,662,600 COX ET AL v Patented Mar. 13, 192,8.

PATEN y marina T; orifice..

JOHN In COX, OF PHILADELPHIA, AND RADCLYFFE -FURNESS,V OF JENKNTOWN,

l Y yPENNSYLVANIA.

NozzLn non LADLns.

Application filed December 21, 1923. Serial No. 681,937.

In the manufacture of' steel and some other metals, the ladle into which the molten metal is poured from the furnace is provided with a discharge orifice, in which is secured a nozzle adapted to be closed by a plug. The nozzle and plug are of heatlresisting material, such as fire-clay or plumbago and clay. `The inner wall, forming the passageway of the nozzle, is con veXly flared at its upper end in approximately the form of a quarter circle in vertical section. The bottom of the plug has an approximately heini-spherical shape. The

plug, when seated, has a tangential circumferential contact with the nozzle, the line of contact intersecting radii which, preferably', are approximately at an angle of about forty-live degrees to the axis of the plug.

It is customary to use nozzles of different internal diameters so as to provide for different rates of pour. Frequently different sized plugs are provided for the diiiierent.

pour but all adapted, also, to be sufficiently closed by the same size plug, thereby dispensing with the necessity of providing plugs of different sizes.

lVe accomplish the specified object by providing a series of nozzles of uniform ezternai shape and size, but of different in'- ternal diameters at their lower ends or discharge mouths and of uniform diameters and contours at their upper, flared, plug-receiving ends. Preferably, and more specifically, the lower part of each nozzle is of uniform internal diameter for asubstantial portion of its height (preferably between one-third and one-half of its height), while above the lower portion the internal diameter gradually increases toward its convexly flared upper end. Each nozzle, therefore, maybe said to have a passageway that is cylindrical in its lower portion, convexly liared at its upper end, and of frusto-conical form between its upper end Vand its lower portion. The internal diameters of the lower portions of the several nozzles are all of different, the diameters and contours of the upper ends of all the nozzles are alike, while the connect*- ing frusto-conical portions of the several nozzles are of uniform diameters at their upper ends but offdiiferent diameters at their lower ends. p

ln the drawings, which showthe preferred and described embodiment of our invention Fig. 1 is a vertical sectional view of that" nozzle of the set which has the largest pour plug positioned to close its vconical shape, converging more or less from the flared upper end to the lower cylindrical portion, as shown at a. The nozzle with the discharge mouth kof greatest diameter may be assumed to be of the same internal n diameter, below its -flaredi1pper end, throughout its height, but it is preferred, even in the nozzle of greatest diameter, that its passageway should converge slightl f from its liared upper end and toward its lower end. All of the nozzles are adapted to be sealed equally well by a single size of plug p. f

Having now fully tion, what kwe claini and desire to protect by Letters Patent is z l. A nozzle for a ladle having a passageway which in its lower portion is of cylindrical shape and which above its lower portion is of frusta-conical form andof sub? stantiallyv greater length than diameter, the mouth of the nozzle above its frusto-conicalv portion being convexly rounded and adapted to be engaged by a plug.

2. A nozzle for a ladle having a passage-` way which at its upper end is convexly rounded, which for a limited distance above its lower end iseylindrical, and which, between its cylindrical portion and` its conveXly rounded upper end, is tapered for a distance greater than the length of said cylindrical portion.

3. A nozzle for a ladle having a through passageway which atene end has a flared described our invenloof mouth adapted to be elosed by ay plug the portion of the passageway at llie other end of l'he nozzle being oi: cylindrical shape and of :my desired diameter less than the diameter of the narrowest part of the flared mouth, the portion of the passageway connecting the flared mouth and the Cylinder portion being of fuiste-conical form and of greater length than diameter Aand having a degree of taper dependentl on the diaineer 1n ofthe cylinder portion of the passageway relative to (lle, diameter of the narrower; part of die flared mouth.

In lestimony of which invenlifm, we have hereunto sety our hands, at Philadelphia, Pa., 15 on this tenth day of December, 15h13.

JOHN L. COX. RADCLYFFE FURNILSS. 

